A5035806301- 3D Surveying and Cultural Heritage
- Remote Sensing and LiDAR Applications
- Maritime and Coastal Archaeology
- Robotics and Sensor-Based Localization
- Image Enhancement Techniques
- Archaeological Research and Protection
- Conservation Techniques and Studies
- Underwater Acoustics Research
- Underwater Vehicles and Communication Systems
- Satellite Image Processing and Photogrammetry
- Augmented Reality Applications
- Remote Sensing in Agriculture
- Hydrology and Watershed Management Studies
- Ancient Mediterranean Archaeology and History
- Flood Risk Assessment and Management
- Dam Engineering and Safety
- Avian ecology and behavior
- Wildlife Ecology and Conservation
- Species Distribution and Climate Change
- Civil and Structural Engineering Research
- Optical measurement and interference techniques
- 3D Modeling in Geospatial Applications
- Land Use and Ecosystem Services
- Solar Radiation and Photovoltaics
- Geotechnical Engineering and Analysis
Cyprus University of Technology
2015-2024
National Technical University of Athens
1997-2018
University of Cyprus
2017
Masaryk University
2017
University College London
1999
There is growing interest for using Spectral Vegetation Indices (SVI) derived by Unmanned Aerial Vehicle (UAV) imagery as a fast and cost-efficient tool plant phenotyping. The development of such tools paramount importance to continue progress through breeding, especially in the Mediterranean basin, where climate change expected further increase yield uncertainty. In present study, Normalized Difference Index (NDVI), Simple Ratio (SR) Green (GNDVI) from UAV were calculated two consecutive...
This paper presents a combined subjective and objective evaluation of an application mixing interactive virtual reality (VR) experience with 360° storytelling. The hypothesis that the modern immersive archaeological VR presenting cultural heritage from submerged site would sustain high levels presence, immersion, general engagement was leveraged in investigation user both (questionnaires) (neurophysiological recording brain signals using electroencephalography (EEG)) methods. Participants...
Abstract. Among the renewable power sources, solar is rapidly becoming popular because it inexhaustible, clean, and dependable. It has also become more efficient since conversion efficiency of photovoltaic cells increased. Following these trends, will affordable in years to come considerable investments are be expected. Despite size plants, sitting procedure a crucial factor for their financial viability. Many aspects influence such decision: legal, environmental, technical, name few. This...
Land cover classification with the focus on chlorophyll-rich vegetation detection plays an important role in urban growth monitoring and planning, autonomous navigation, drone mapping, biodiversity conservation, etc. Conventional approaches usually apply normalized difference index (NDVI) for detection. In this paper, we investigate performance of deep learning conventional methods Two methods, DeepLabV3+ our customized convolutional neural network (CNN) were evaluated respect to their when...
The very shallow marine basin of Puck Lagoon in the southern Baltic Sea, on Northern coast Poland, hosts valuable benthic habitats and cultural heritage sites. These include, among others, protected Zostera marina meadows, one Baltic's major medieval harbours, a ship graveyard, likely other submerged features that are yet to be discovered. Prior this project, no comprehensive high-resolution remote sensing data were available for area. This article describes first Digital Elevation Models...
Although aerial image-based bathymetric mapping can provide, unlike acoustic or LiDAR (Light Detection and Ranging) sensors, both water depth visual information, refraction poses significant challenges for accurate estimation. In order to tackle this challenge, we propose an image correction methodology, which first exploits recent machine learning procedures that recover from dense point clouds then corrects on the original imaging dataset. This way, structure motion (SfM) multi-view stereo...
Abstract. The determination of accurate bathymetric information is a key element for near offshore activities, hydrological studies such as coastal engineering applications, sedimentary processes, hydrographic surveying well archaeological mapping and biological research. UAV imagery processed with Structure from Motion (SfM) Multi View Stereo (MVS) techniques can provide low-cost alternative to established shallow seabed offering the important visual information. Nevertheless, water...
Abstract. The merging of photogrammetry and computer vision has raised discussions regarding its ability to produce very dense point clouds, comparable, under circumstances terrestrial laser scanning (TLS). This paper approaches this issue in terms accuracy, density, methodology ease use. Three tests have been conducted evaluate the process as well data quality, registration methodology. At first test a 300 mm sphere with texture used reference object is order address quality using image...
Underwater photogrammetry is a difficult task by definition. When time limits are imposed on both acquisition and processing time, it becomes even more complicated. In addition when resources limited the main deliverable should be complete 3D model, only novel method may match requirements. Under aforementioned conditions, new using combination of computer vision techniques was utilised open source software to face demands.
Abstract. This paper investigates immersive technologies to increase exploration time in an underwater archaeological site, both for the public, as well as, researchers and scholars. Focus is on Mazotos shipwreck site Cyprus, which located 44 meters underwater. The aim of this work two-fold: (a) realistic modelling mapping (b) virtual reality visit. For 3D optical data were used. composed a variety sea elements including: plants, fish, stones, artefacts, are randomly positioned. Users can...
Well preserved ancient shipwrecks are rare in the archaeological record, but when discovered, they can provide valuable information on a wide range of research issues if analyzed and documented properly. In this paper we discuss significance, potential, constraints mapping methods applied during underwater excavation shipwreck sites with special emphasis stratigraphy, documentation finds, reconstruction site formation processes. As case study, present digital photogrammetry computer vision...
Images obtained in an underwater environment are often affected by colour casting and suffer from poor visibility lack of contrast. In the literature, there many enhancement algorithms that improve different aspects imagery. Each paper, when presenting a new algorithm or method, usually compares proposed technique with some alternatives present current state art. There no studies on reliability benchmarking methods, as comparisons based various subjective objective metrics. This paper would...
The determination of accurate bathymetric information is a key element for near offshore activities; hydrological studies, such as coastal engineering applications, sedimentary processes, hydrographic surveying, archaeological mapping and biological research. Through structure from motion (SfM) multi-view-stereo (MVS) techniques, aerial imagery can provide low-cost alternative compared to LiDAR (Light Detection Ranging) surveys, it offers additional important visual higher spatial...
Marine animal forests are benthic communities dominated by sessile suspension feeders (such as sponges, corals, and bivalves) able to generate three-dimensional (3D) frameworks with high structural complexity. The biodiversity functioning of marine strictly related their 3D present paper aims at providing new perspectives in underwater optical surveys. Starting from the current gaps data collection analysis that critically limit study conservation forests, we discuss main technological...
The Underwater Cultural Heritage (UCH) represents a vast historical and scientific resource that, often, is not accessible to the general public due environment depth where it located. Digital technologies (Virtual Museums, Virtual Guides Reconstruction of Heritage) provide unique opportunity for digital accessibility both scholars public, interested in having better grasp underwater sites maritime archaeology. This paper presents architecture first results Horizon 2020 i-MARECULTURE...
Photogrammetry using structure from motion (SfM) techniques has evolved into a powerful tool for variety of applications. Nevertheless, limits are imposed when two-media photogrammetry is needed, in cases such as submerged archaeological site documentation. Water refraction poses clear limit on photogrammetric applications, especially traditional methods and standardized pipelines followed. This work tries to estimate the error introduced depth measurements no correction model used proposes...
In recent years, Autonomous Unmanned Aerial Vehicles (AUAV) became popular among researchers across disciplines because they combine many advantages. One major application is monitoring and mapping. Their ability to fly beyond eye sight autonomously, collecting data over large areas whenever, wherever, makes them excellent platform for hazardous or disasters. both cases rapid mapping needed while human access isn't always a given. Indeed, current automatic processing of aerial photos using...
Augmented reality can be deployed in various application domains, such as enhancing human vision, manufacturing, medicine, military, entertainment, and archeology. One of the least explored areas is underwater environment. The main benefit augmented these environments that it help divers navigate to points interest or present interesting information about archaeological touristic sites (e.g., ruins buildings, shipwrecks). However, harsh sea environment affects computer vision algorithms...
Abstract. In this paper, main challenges of underwater photogrammetry in shallow waters are described and analysed. The very short camera to object distance such cases, as well buoyancy issues, wave effects turbidity the be resolved. Additionally, major challenge all, caustics, is addressed by a new approach for caustics removal (Forbes et al., 2018) which applied order investigate its performance terms SfM-MVS 3D reconstruction results. proposed complex problem removing classifying then...
In this paper, a new methodology for delineating Hydrological Response Units (HRUs), based on the Curve Number (CN) concept, is presented. Initially, semi-automatic procedure in GIS environment used to produce basin maps of distributed CN values as product three classified layers, soil permeability, land use/land cover characteristics and drainage capacity. The map context model parameterization, order identify essential number spatial extent HRUs and, consequently, control variables...